1. Electric Power Research Institute, CSG EHV Power Transmission Company,Guangzhou,China
2. NR Electric Power Electronics Co., Ltd.,Changzhou,China
3. Xi'an Jiaotong University,State Key Laboratory of Electrical Insulation and Power Equipment,Xi'an,China
4. Electric Power Research Institute,CSG,Guangzhou,China
5. Nanjing Nari-Relays Electric Co., Ltd.,Nangjing,China